alamb commented on code in PR #13876:
URL: https://github.com/apache/datafusion/pull/13876#discussion_r1896174869


##########
.github/actions/setup-rust-runtime/action.yaml:
##########
@@ -34,5 +34,6 @@ runs:
         echo "RUSTC_WRAPPER=sccache" >> $GITHUB_ENV  
         echo "SCCACHE_GHA_ENABLED=true" >> $GITHUB_ENV 
         echo "RUST_BACKTRACE=1" >> $GITHUB_ENV
+        echo "CARGO_INCREMENTAL=false" >> $GITHUB_ENV

Review Comment:
   It seems like this may be redundant with the line below (or if the line 
below isn't working. perhaps we could remove it 🤔 )



##########
.github/workflows/rust.yml:
##########
@@ -288,17 +318,20 @@ jobs:
           mv *.tbl ../datafusion/sqllogictest/test_files/tpch/data
       - name: Verify that benchmark queries return expected results
         run: |
+          # increase stack size to fix stack overflow
+          export RUST_MIN_STACK=20971520

Review Comment:
   I think we should have fixed this now with the recursive protection feature 
-- do we still need to set the min stack size?



##########
.github/workflows/rust.yml:
##########
@@ -347,21 +385,23 @@ jobs:
 #          cd datafusion-cli
 #          cargo test --lib --tests --bins --all-features
 
-  macos:
-    name: cargo test (macos)
-    runs-on: macos-latest
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          submodules: true      
-      - name: Setup Rust toolchain
-        uses: ./.github/actions/setup-macos-builder       
-      - name: Run tests (excluding doctests)
-        shell: bash
-        run: |
-          cargo test --lib --tests --bins --features avro,json,backtrace
-          cd datafusion-cli
-          cargo test --lib --tests --bins --all-features  
+# Commenting out intel mac build as so few users would ever use it

Review Comment:
   maybe we can also link to https://github.com/apache/datafusion/issues/13846



##########
Cargo.toml:
##########
@@ -170,6 +170,17 @@ overflow-checks = false
 panic = 'unwind'
 rpath = false
 
+[profile.ci]
+inherits = "dev"
+incremental = false
+
+# ci turns off debug info, etc for dependencies to allow for smaller binaries 
making caching more effective
+[profile.ci.package."*"]
+debug = false

Review Comment:
   We also found this setting particularly effective for speeding up our CI in 
influxdb_iox: https://doc.rust-lang.org/cargo/reference/profiles.html#debug



##########
.github/actions/setup-builder/action.yaml:
##########
@@ -42,6 +42,8 @@ runs:
         "${RETRY[@]}" rustup component add rustfmt
     - name: Configure rust runtime env
       uses: ./.github/actions/setup-rust-runtime
+    - name: Setup Rust cache
+      uses: Swatinem/rust-cache@v2

Review Comment:
   This is basically my only concern with the PR (using a third-party github 
action)
   
   I took a brief look through https://github.com/Swatinem/rust-cache and it 
seems like it does non trivial work (there is a lot of code) and it says:
   
   > It is also most effective for repositories with a Cargo.lock file. Library 
repositories with only a Cargo.toml file have limited benefits, as cargo will 
always use the most up-to-date dependency versions, which may not be cached.
   
   I made an experimental PR to see how much this particular action saves in 
terms of time:
   - https://github.com/apache/datafusion/pull/13889
   
   If it doesn't save a huge amount of time, I think we should consider not 
using it
   



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